Package org.apache.hadoop.hdfs

A distributed implementation of FileSystem.

See: Description

Class Summary

Class	Description
DFSInotifyEventInputStream	Stream for reading inotify events.
ReplicaAccessor	The public API for ReplicaAccessor objects.
ReplicaAccessorBuilder	The public API for creating a new ReplicaAccessor.

Exception Summary

Exception	Description
CannotObtainBlockLengthException	This exception is thrown when the length of a LocatedBlock instance can not be obtained.
UnknownCipherSuiteException	Thrown when an unknown cipher suite is encountered.
UnknownCryptoProtocolVersionException

Package org.apache.hadoop.hdfs Description

A distributed implementation of FileSystem. This is loosely modelled after Google's GFS.

The most important difference is that unlike GFS, Hadoop DFS files have strictly one writer at any one time. Bytes are always appended to the end of the writer's stream. There is no notion of "record appends" or "mutations" that are then checked or reordered. Writers simply emit a byte stream. That byte stream is guaranteed to be stored in the order written.